Dimensional crossover in spin-orbit-coupled semiconductor nanowires with induced superconducting pairing

被引：52

作者：

Stanescu, Tudor D. ^{[1
]}

Lutchyn, Roman M. ^{[2
]}

Das Sarma, S. ^{[3
]}

机构：

[1] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA

[2] Microsoft Res, Stn Q, Santa Barbara, CA 93106 USA

[3] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 09期

关键词：

MAJORANA FERMIONS; SIGNATURE;

D O I：

10.1103/PhysRevB.87.094518

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show that the topological Majorana modes in nanowires much longer than the superconducting coherence length are adiabatically connected with discrete zero-energy states generically occurring in short nanowires. We demonstrate that these zero-energy crossings can be tuned by an external magnetic field and are protected by the particle-hole symmetry. We study the evolution of the low-energy spectrum and the splitting oscillations as a function of magnetic field, wire length, and chemical potential, manifestly establishing that the low-energy physics of short wires is related to that occurring in long wires. This physics, which represents a hallmark of spinless p-wave superconductivity, can be observed in tunneling conductance measurements. DOI: 10.1103/PhysRevB.87.094518

引用

页数：6

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